Narrated Ibn Abbas: When the Messenger of Allah ﷺ came to Madina, they were paying one, two and three years in advance for fruits, so he said: Those who pay in advance for anything, must do for a specified measure and weight with a specified time fixed.
Hadith Referenceسنن ابي داود / كتاب الإجارة / 3463
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:صحيح بخاري (2240) صحيح مسلم (1604)